JPH06209531A - Automatic correction method of thermistor voltage for battery-temperature detection by microcomputer - Google Patents
Automatic correction method of thermistor voltage for battery-temperature detection by microcomputerInfo
- Publication number
- JPH06209531A JPH06209531A JP1673693A JP1673693A JPH06209531A JP H06209531 A JPH06209531 A JP H06209531A JP 1673693 A JP1673693 A JP 1673693A JP 1673693 A JP1673693 A JP 1673693A JP H06209531 A JPH06209531 A JP H06209531A
- Authority
- JP
- Japan
- Prior art keywords
- thermistor
- voltage
- temperature
- battery
- microcomputer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は充電器に使用される電池
温度の検出に関し、特にマイコンによる電池温度検出用
サーミスタ電圧の自動補正方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to detection of a battery temperature used in a charger, and more particularly to a method for automatically correcting a battery temperature detection thermistor voltage by a microcomputer.
【０００２】[0002]
【従来の技術】充電器から電池を充電する場合に、充電
器とバッテリーパック間をカールコードで接続する場合
が多い。このバッテリーパックには温度検出用のサーミ
スタが備えられており、充電時には電池を収納して使用
する。電池の温度は、サーミスタ回路にサーミスタ電流
を充電器から流し、サーミスタ回路に発生する電圧降下
から検出する。2. Description of the Related Art When charging a battery from a charger, a curl cord is often used to connect the charger and the battery pack. This battery pack is equipped with a thermistor for temperature detection, and the battery is stored and used during charging. The temperature of the battery is detected from the voltage drop generated in the thermistor circuit by flowing the thermistor current from the charger to the thermistor circuit.
【０００３】[0003]
【発明が解決しようとする課題】しかし、カールコード
は割合に長く、かつ、芯線は細いので、特に充電電流の
多い急速充電を行う場合には、この充電電流による電圧
降下分の影響を受け、サーミスタ回路電圧とサーミスタ
抵抗とサーミスタ電流の積であるサーミスタ電圧が一致
しなくなるという問題がある。However, since the curl cord is relatively long and the core wire is thin, it is affected by the voltage drop due to the charging current, especially when performing rapid charging with a large charging current. There is a problem that the thermistor voltage, which is the product of the thermistor circuit voltage, the thermistor resistance, and the thermistor current, does not match.
【０００４】本発明はこのような点に鑑みてなされたも
のであり、マイコンが充電電流を設定していることを利
用し、充電電流の設定が任意の値であっても真のサーミ
スタ電圧の値を読むことができるようにしたマイコンに
よる電池温度検出用サーミスタ電圧の自動補正方法を提
供することを目的とする。The present invention has been made in view of the above circumstances, and utilizes the fact that the microcomputer sets the charging current, so that even if the charging current is set to an arbitrary value, the true thermistor voltage It is an object of the present invention to provide an automatic correction method of a battery temperature detecting thermistor voltage by a microcomputer capable of reading a value.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に本発明のマイコンによる電池温度検出用サーミスタ電
圧の自動補正方法は、マイコンにより電池の充電電流を
設定し、電池温度をサーミスタ電圧によって検出するマ
イコンによる電池温度検出用サーミスタ電圧の自動補正
方法において、電池に流す充電電流とサーミスタに流す
サーミスタ電流とサーミスタ回路に発生するサーミスタ
回路電圧とを監視し、サーミスタ回路電圧からサーミス
タ電流と充電電流が共通に流れる回路における充電電流
による電圧降下分を自動的に補正してサーミスタ電圧を
得ることに特徴を有している。In order to solve the above-mentioned problems, a method for automatically correcting a battery temperature detecting thermistor voltage by a microcomputer of the present invention is to set a battery charging current by the microcomputer and detect the battery temperature by the thermistor voltage. In the method of automatically correcting the thermistor voltage for battery temperature detection by the microcomputer, the charging current flowing in the battery, the thermistor current flowing in the thermistor and the thermistor circuit voltage generated in the thermistor circuit are monitored, and the thermistor current and the charging current It is characterized in that the thermistor voltage is obtained by automatically correcting the voltage drop due to the charging current in the commonly flowing circuits.
【０００６】[0006]
【作用】マイコンにより常温時の急速充電電流、高温，
低温時のトリクル充電電流を設定する。また、充電電流
を切替える温度も併せて設定する。電池に流す充電電流
とサーミスタに流すサーミスタ電流とサーミスタ回路に
発生するサーミスタ回路電圧を監視する。サーミスタ回
路電圧からサーミスタ電流と充電電流が共通に流れる回
路における充電電流による電圧降下分を自動的に補正し
た真のサーミスタ電圧を得る。[Operation] Quick charge current at normal temperature, high temperature,
Set the trickle charge current at low temperature. The temperature at which the charging current is switched is also set. The charging current flowing in the battery, the thermistor current flowing in the thermistor, and the thermistor circuit voltage generated in the thermistor circuit are monitored. From the thermistor circuit voltage, the true thermistor voltage is obtained by automatically correcting the voltage drop due to the charging current in the circuit in which the thermistor current and the charging current commonly flow.
【０００７】[0007]
【実施例】以下、本発明の一実施例を図面に基づいて説
明する。図１は本発明のマイコンによる電池温度検出用
サーミスタ電圧の自動補正方法を実施するための基本回
路構成である。図において、１は充電器であり、充電電
流制御素子２、マイコン（制御部）３が設けられてい
る。４はバッテリーパックであり、サーミスタＴｈが設
けられており、電池５を格納するようになっている。６
は直流電源であり、７はカールコードである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a basic circuit configuration for carrying out an automatic correction method of a battery temperature detecting thermistor voltage by a microcomputer of the present invention. In the figure, 1 is a charger, which is provided with a charging current control element 2 and a microcomputer (control unit) 3. A battery pack 4 is provided with a thermistor Th and stores a battery 5. 6
Is a DC power supply, and 7 is a curl cord.
【０００８】Ｉ1 は電池５を充電する充電電流、Ｉ2 は
サーミスタＴｈに流れるサーミスタ電流である。Ｒ1 は
充電電流Ｉ1 が流れるカールコード７の回路抵抗、Ｒ2
はサーミスタ電流Ｉ2 が流れるカールコード７の回路抵
抗、Ｒ3 は充電電流Ｉ1 とサーミスタ電流Ｉ2 が流れる
カールコード７の回路抵抗、ＲTHは温度によって変化す
るサーミスタＴｈの抵抗である。I 1 is a charging current for charging the battery 5, and I 2 is a thermistor current flowing through the thermistor Th. R 1 is the circuit resistance of the curl cord 7 through which the charging current I 1 flows, R 2
Is the circuit resistance of the curl cord 7 through which the thermistor current I 2 flows, R 3 is the circuit resistance of the curl cord 7 through which the charging current I 1 and the thermistor current I 2 flow, and R TH is the resistance of the thermistor Th that changes with temperature.
【０００９】ここでサーミスタ電圧をＶTHとし、マイコ
ン３が検出するサーミスタ回路電圧をＶINとする。充電
器１のマイコン３により、電池５の内部温度をサーミス
タ回路電圧ＶINによって検出する。その際、サーミスタ
Ｔｈに流れるループ上の抵抗により、充電電流Ｉ1 が変
化すると、サーミスタ回路電圧ＶINも変動する。すなわ
ち、マイコン３が検出するサーミスタ回路電圧ＶINと実
際のサーミスタ電圧ＶTHとは一致しない。サーミスタ回
路電圧ＶINは以下の式で表せる。 ＶIN＝（Ｒ2 ＋ＲTH）Ｉ2 ＋Ｒ3 （Ｉ1 ＋Ｉ2 ）─────────（１） ここでＲ1 ＝Ｒ2 ＝Ｒ3 とすると、 ＶIN＝Ｒ1 （２Ｉ2 ＋Ｉ1 ）＋ＲTHＩ2 ─────────────（２） また、Ｒ1 Ｉ2 は他項に比べると値が非常に小さいので
無視すると、 つまり、サーミスタ電圧ＶTHに回路抵抗抗Ｒ1 ×充電電
流Ｉ1 を加えたものがサーミスタ回路電圧ＶINになる。
通常はマイコン３の設定を式（３）の第１項のＲTHＩ2
だけで行っているが、充電電流Ｉ1 及び回路抵抗Ｒ1 が
大きくなると第２項のＲ1 Ｉ1 が無視できなくなる。す
なわち、下記の式（４）を用いて正確な温度検出用のサ
ーミスタ電圧を得るようにする。 ＶTH＝ＲTHＩ2 ＝ＶIN−Ｒ1 Ｉ1 ────────────────（４）Here, the thermistor voltage is V TH, and the thermistor circuit voltage detected by the microcomputer 3 is V IN . The microcomputer 3 of the charger 1 detects the internal temperature of the battery 5 with the thermistor circuit voltage V IN . At that time, when the charging current I 1 changes due to the resistance on the loop flowing through the thermistor Th, the thermistor circuit voltage V IN also changes. That is, the thermistor circuit voltage V IN detected by the microcomputer 3 does not match the actual thermistor voltage V TH . The thermistor circuit voltage V IN can be expressed by the following equation. V IN = (R 2 + R TH ) I 2 + R 3 (I 1 + I 2 ) ────────── (1) If R 1 = R 2 = R 3 then V IN = R 1 ( 2I 2 + I 1 ) + R TH I 2 ───────────── (2) In addition, the value of R 1 I 2 is very small compared to other terms, so if you ignore it, That is, the thermistor circuit voltage V IN is obtained by adding the circuit resistance anti-R 1 × charging current I 1 to the thermistor voltage V TH .
Normally, the setting of the microcomputer 3 is set to R TH I 2 in the first term of the equation (3).
However, when the charging current I 1 and the circuit resistance R 1 become large, the second term R 1 I 1 cannot be ignored. That is, an accurate thermistor voltage for temperature detection is obtained using the following equation (4). V TH = R TH I 2 = V IN -R 1 I 1 ──────────────── (4)
【００１０】図２はマイコンに設定される温度設定値の
説明図である。図において横軸は温度、縦軸は充電電流
である。電池温度が高温時には比較的電流の少ないトリ
クル充電を行う。温度が低下してＣ１以下の常温になる
と、比較的電流の多い急速充電に移行する。温度が更に
低下してＣ３以下の低温になると急速充電からトリクル
充電に移行する。また、電池温度が低温時にはトリクル
充電を行う。温度が上昇してＣ４以上の常温になると、
急速充電に移行する。温度が更に上昇してＣ２以上の高
温になると急速充電からトリクル充電に移行する。この
様に、温度設定値によって充電電流を切換える場合に
は、正確な電池温度を検出する必要があり、サーミスタ
回路電圧からサーミスタ電流と充電電流が共通に流れる
回路における充電電流による電圧降下分を考慮したサー
ミスタ電圧を得るようにしている。FIG. 2 is an explanatory diagram of temperature setting values set in the microcomputer. In the figure, the horizontal axis represents temperature and the vertical axis represents charging current. When the battery temperature is high, trickle charging with a relatively small current is performed. When the temperature drops to a normal temperature of C1 or less, the rapid charging with a relatively large current is started. When the temperature further decreases and reaches a low temperature of C3 or lower, the quick charge shifts to the trickle charge. When the battery temperature is low, trickle charging is performed. When the temperature rises to normal temperature of C4 or higher,
Move to quick charge. When the temperature further rises and reaches a high temperature of C2 or higher, the quick charge shifts to trickle charge. In this way, when switching the charging current according to the temperature setting value, it is necessary to detect the accurate battery temperature, and consider the voltage drop due to the charging current in the circuit where the thermistor current and charging current commonly flow from the thermistor circuit voltage. I tried to get the thermistor voltage.
【００１１】[0011]
【発明の効果】以上説明したように、本発明のマイコン
による電池温度検出用サーミスタ電圧の自動補正方法
は、電池に流す充電電流とサーミスタに流すサーミスタ
電流とサーミスタ回路に発生するサーミスタ回路電圧と
を監視し、サーミスタ回路電圧からサーミスタ電流と充
電電流が共通に流れる回路における充電電流による電圧
降下分を自動的に補正してサーミスタ電圧を得るように
したので、マイコンが充電電流を設定していることを利
用し、充電電流の設定が任意の値であってもサーミスタ
回路電圧からサーミスタ電流とそのマイコンの設定値で
ある充電電流が共通に流れる回路における充電電流によ
る電圧降下分を差し引いた真のサーミスタ電圧の値を読
むことができ、正確な電池温度を検出することができ
る。As described above, according to the method of automatically correcting the battery temperature detecting thermistor voltage by the microcomputer of the present invention, the charging current flowing in the battery, the thermistor current flowing in the thermistor and the thermistor circuit voltage generated in the thermistor circuit are calculated. The microcomputer sets the charging current because the thermistor voltage is monitored to automatically correct the voltage drop due to the charging current in the circuit where the thermistor current and charging current commonly flow from the thermistor circuit voltage to obtain the thermistor voltage. Even if the charging current is set to an arbitrary value, the true thermistor is obtained by subtracting the voltage drop due to the charging current in the circuit where the thermistor current and the charging current that is the setting value of the microcomputer commonly flow from the thermistor circuit voltage. The voltage value can be read and the accurate battery temperature can be detected.
【図１】マイコン制御によるサーミスタ電圧から電池温
度検出を説明する図である。FIG. 1 is a diagram for explaining battery temperature detection from a thermistor voltage under microcomputer control.
【図２】マイコン制御による温度設定値と充電電流との
関係を示す図である。FIG. 2 is a diagram showing a relationship between a temperature set value and a charging current controlled by a microcomputer.
１ 充電器 ２ 充電電流制御素子 ３ マイコン ４ バッテリーパック ５ 電池 ６ 直流電源 ７ カールコード 1 Charger 2 Charging current control element 3 Microcomputer 4 Battery pack 5 Battery 6 DC power supply 7 Curl code
Claims (2)
し、 電池温度をサーミスタ電圧によって検出するマイコンに
よる電池温度検出用サーミスタ電圧の自動補正方法にお
いて、 電池に流す充電電流とサーミスタに流すサーミスタ電流
とサーミスタ回路に発生するサーミスタ回路電圧とを監
視し、 サーミスタ回路電圧からサーミスタ電流と充電電流が共
通に流れる回路における充電電流による電圧降下分を自
動的に補正してサーミスタ電圧を得ることを特徴とする
マイコンによる電池温度検出用サーミスタ電圧の自動補
正方法。1. A method of automatically correcting a battery temperature detecting thermistor voltage by a microcomputer which sets a battery charging current by a microcomputer and detects a battery temperature by a thermistor voltage. A charging current flowing through the battery, a thermistor current flowing through the thermistor and a thermistor. A microcomputer that monitors the thermistor circuit voltage generated in the circuit and automatically corrects the voltage drop due to the charging current in the circuit in which the thermistor current and the charging current flow in common from the thermistor circuit voltage to obtain the thermistor voltage. Automatic correction method of thermistor voltage for battery temperature detection by.
ル充電から常温の急速充電に移行させる温度Ｃ１、 逆に、常温の急速充電から高温のトリクル充電に移行さ
せる温度Ｃ２、 また、常温の急速充電から低温のトリクル充電に移行さ
せる温度Ｃ３、 及び低温のトリクル充電から常温の急速充電に移行させ
る温度Ｃ４等の温度設定値は、 サーミスタ回路電圧からサーミスタ電流と充電電流が共
通に流れる回路における充電電流による電圧降下分を自
動的に補正したサーミスタ電圧から得ることを特徴とす
る請求項１記載のマイコンによる電池温度検出用サーミ
スタ電圧の自動補正方法。2. A temperature C1 at which a high temperature trickle charge set in the microcomputer is shifted to a normal temperature rapid charge, and conversely, a temperature C2 at which a normal temperature rapid charge is shifted to a high temperature trickle charge, and a normal temperature rapid charge. Temperature C3 to shift from low temperature trickle charge to low temperature trickle charge and temperature C4 to shift from low temperature trickle charge to normal temperature quick charge are the charging current in the circuit where the thermistor circuit voltage and the thermistor current and the charging current flow in common. 2. The method for automatically correcting the thermistor voltage for battery temperature detection by the microcomputer according to claim 1, wherein the voltage drop due to is obtained from the thermistor voltage automatically corrected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5016736A JP2527401B2 (en) | 1993-01-06 | 1993-01-06 | Automatic correction method of thermistor voltage for battery temperature detection by microcomputer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5016736A JP2527401B2 (en) | 1993-01-06 | 1993-01-06 | Automatic correction method of thermistor voltage for battery temperature detection by microcomputer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06209531A true JPH06209531A (en) | 1994-07-26 |
| JP2527401B2 JP2527401B2 (en) | 1996-08-21 |
Family
ID=11924560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5016736A Expired - Lifetime JP2527401B2 (en) | 1993-01-06 | 1993-01-06 | Automatic correction method of thermistor voltage for battery temperature detection by microcomputer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2527401B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007325500A (en) * | 2001-02-14 | 2007-12-13 | Sony Corp | Charger/discharger and charging/discharging method, power supply device and method, power supply system and method, program storage medium, and program |
| US7525288B2 (en) | 2001-02-14 | 2009-04-28 | Sony Corporation | Charging/discharging apparatus and method, power supplying apparatus and method, power supplying system and method, program storing medium, and program |
| JP2010057250A (en) * | 2008-08-27 | 2010-03-11 | Canon Inc | Charging system and charging device |
| JP2011055588A (en) * | 2009-08-31 | 2011-03-17 | Hitachi Koki Co Ltd | Charger |
| CN109358693A (en) * | 2018-10-31 | 2019-02-19 | 北京机械设备研究所 | A kind of thermal cell activation power supply and its distal line voltage-drop compensation device |
| CN112713322A (en) * | 2019-10-24 | 2021-04-27 | 北京小米移动软件有限公司 | Battery temperature determination method, battery temperature determination device, and storage medium |
-
1993
- 1993-01-06 JP JP5016736A patent/JP2527401B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007325500A (en) * | 2001-02-14 | 2007-12-13 | Sony Corp | Charger/discharger and charging/discharging method, power supply device and method, power supply system and method, program storage medium, and program |
| US7525288B2 (en) | 2001-02-14 | 2009-04-28 | Sony Corporation | Charging/discharging apparatus and method, power supplying apparatus and method, power supplying system and method, program storing medium, and program |
| US7615963B2 (en) | 2001-02-14 | 2009-11-10 | Sony Corporation | Charging/discharging apparatus and method, power supplying device and method, power supplying systems and method, program storing medium, and program |
| JP2010057250A (en) * | 2008-08-27 | 2010-03-11 | Canon Inc | Charging system and charging device |
| JP2011055588A (en) * | 2009-08-31 | 2011-03-17 | Hitachi Koki Co Ltd | Charger |
| CN109358693A (en) * | 2018-10-31 | 2019-02-19 | 北京机械设备研究所 | A kind of thermal cell activation power supply and its distal line voltage-drop compensation device |
| CN112713322A (en) * | 2019-10-24 | 2021-04-27 | 北京小米移动软件有限公司 | Battery temperature determination method, battery temperature determination device, and storage medium |
| CN112713322B (en) * | 2019-10-24 | 2022-05-03 | 北京小米移动软件有限公司 | Battery temperature determination method, battery temperature determination device, and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2527401B2 (en) | 1996-08-21 |
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